These are baseless and misleading accusations. In WWII many tens of thousands of civilians died because of erroneous bombings and no one ever got accused of "war crimes" over them.

In a war mistakes are made and people will die as a result. But that doesn't mean they're war crimes. Blaming the U.S. whilst leaving Iran alone, which blatantly attacks civilian infrastructure, makes the U.N. look biased and nefarious.